> For the complete documentation index, see [llms.txt](https://docs.imerit.net/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.imerit.net/3d-multi-sensor-fusion/labeling/3d-multi-sensor-fusion-labeling-editor/key-features/auto-grounding-for-cuboids-and-polylines.md).

# Auto-Grounding for Cuboids and Polylines

Autogrounding is a feature that automatically aligns cuboids and polylines to the ground in a point cloud environment. This ensures that annotations are accurately positioned on the surface without requiring manual adjustments. By leveraging the sensor data, the tool detects the ground level and adjusts the objects accordingly, improving efficiency and consistency.

{% hint style="info" icon="lightbulb-on" %}
Auto-Grounding Mode offers configurable options to define which reference surface should be considered as the ground during annotation.
{% endhint %}

![](https://content.gitbook.com/content/TcOUG6rfWxqGM0N4db2P/blobs/ztnfg1W3QLByOVnaOL8i/image)

***

## Benefits

* Saves Time: Reduces the need for manual positioning, allowing experts to focus on other critical tasks.
* Increases Accuracy: Ensures annotations are correctly aligned with the ground, minimizing errors in labeling.
* Enhances Consistency: Standardizes the annotation process across different frames and datasets.
* Reduces Effort: Automates a repetitive task, improving the overall workflow for annotation experts.

***

## Steps to use Autogrounding

{% stepper %}
{% step %}

#### Select tool

Select either the Cuboid or 3D Polyline tool.
{% endstep %}

{% step %}

#### Enable autogrounding

Enable autogrounding — a “+” icon will appear beside the Autoground icon.
{% endstep %}

{% step %}

#### Choose grounding source

Choose your preferred grounding source. Options include:

* Classified Ground Points:
  * Tool’s internal algorithm (default)
  * ML Ground Segmentation
  * Customer-provided Ground vs Non-Ground segregation with the dataset
* Lowest height value
  {% endstep %}

{% step %}

#### Automatic alignment

Your annotations will now auto-align to the selected ground reference for better accuracy and speed.
{% endstep %}

{% step %}

#### Verify and adjust

Verify the positioning of the annotation and make manual adjustments to refine the alignment if needed.
{% endstep %}

{% step %}

#### Save

Save the changes.
{% endstep %}
{% endstepper %}


---

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